. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GROWTH OF A POND SNAIL. 55 the largest 25 mm. in length and u mm. in width. The mean length and mean width for this group was X mm. and the mean index of stature was In group II. there were 21 individuals which had a minimum and maximum length and breadth of 26 X n and 28 X mm. respectively with a mean of X mm. and a mean index of stature of In group III. there were 14 individuals which had a minimum. FIG. 5 shows the effect of distilled water. The snails used in this experiment are f
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GROWTH OF A POND SNAIL. 55 the largest 25 mm. in length and u mm. in width. The mean length and mean width for this group was X mm. and the mean index of stature was In group II. there were 21 individuals which had a minimum and maximum length and breadth of 26 X n and 28 X mm. respectively with a mean of X mm. and a mean index of stature of In group III. there were 14 individuals which had a minimum. FIG. 5 shows the effect of distilled water. The snails used in this experiment are from the same egg mass as those in Fig. 6 and were reared in a fingerbowl until 26 days old when they were isolated in distilled water, fed leaf lettuce and filter paper, excrement siphoned off and fresh medium added every two or three days. B, 3 individuals kept away from the window so that no sunshine could pass through glass to them. H, 3 individuals kept near the window so that the sun could shine through glass onto them about 45 minutes each bright day. L, 3 individuals, kept away from window with B, but aerated 15-20 minutes during the day at least four times each week. N, 3 individuals kept near the window with H and aerated with L. Since the controls died comparison may be made with Fig. 7, B, C; 8, N and with the master control. and maximum length and breadth of 29 X 12 and X 15mm., a mean of 31 X and an index of stature of Thus the mean measurements of these 44 individuals at the age of 169 days was X II-53 mm- and index of stature, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-;
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
